独立主格结构没有主语和谓语，所以在语法上不是句子。但它是一种具有逻辑主谓关系的独立结构，其逻辑主语多有名词或代词充当，逻辑谓语主要由分词、不定式、名词、形容词、副词或介词短语担任。独立主格结构常位于句首或句末，常用逗号与句子其它成份隔开，一般只用于书面用? An independent nominative structure has no subject and predicate, so it is not syntactically a sentence. But it is a kind of independent structure with the relationship between logic and predicate. Its logical subject mostly has nouns or pronouns. Logical predicates mainly consist of participles, infinitives, nouns, adjectives, adverbs or prepositional phrases. The structure of an independent master is often located at the beginning or end of a sentence, often separated by commas and other elements of the sentence, generally used only for writing purposes.